Restore CLI diff viewer (#621) #6501

Job	Run time
build-and-check	3m 0s
test-integration-packages/internal	1m 15s
test-integration-packages/billing	1m 8s
test-integration-web	43s
test-integration-packages/agent-runtime	45s
test-integration-common	49s
test-integration-cli	44s
test-integration-sdk	1m 19s
test-cli	1m 0s
test-packages/billing	43s
test-.agents	48s
test-packages/internal	58s
test-packages/agent-runtime	50s
test-web	1m 11s
test-sdk	47s
test-common	52s
	16m 52s

Provide feedback